发明名称 |
Efficient hardware implementation for signal reconstruction over multiple analog-to-digital, digital-to-analog conversions in a telecommunication system |
摘要 |
Method and apparatus for providing an improved quality voice band channel equalization in telecommunication systems employing v.90 transmission standard in which PCM modem signals passing through a digital-to-analog and analog-to-digital conversion processes between a central office switch and a multiple subscriber access system may be reconstructed with improved quality at the A/D converter side by variably adjusting the gain between the digital-to-analog conversion process at the central office switch and the analog-to-digital conversion process at the multiple subscriber access system, and low pass filtering the signal using a second order low pass notch filter to provide a boost of 6 dB at a frequency of 4 KHz.
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申请公布号 |
US6885698(B1) |
申请公布日期 |
2005.04.26 |
申请号 |
US20010811356 |
申请日期 |
2001.03.16 |
申请人 |
GODIGITAL NETWORKS CORPORATION |
发明人 |
LIAW JIN-NAN;LIU HAIBIN;HON JAMES;NORRELL ANDREW L. |
分类号 |
H04L25/49;(IPC1-7):H04B1/38;H04L5/16 |
主分类号 |
H04L25/49 |
代理机构 |
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主权项 |
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地址 |
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